/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.explorer.ui.process;

import com.vaadin.data.Item;
import com.vaadin.data.Property;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.ui.Table;
import org.activiti.explorer.ExplorerApp;
import org.activiti.explorer.data.LazyLoadingContainer;
import org.activiti.explorer.data.LazyLoadingQuery;
import org.activiti.explorer.navigation.UriFragment;
import org.activiti.explorer.ui.AbstractTablePage;
import org.activiti.explorer.ui.Images;
import org.activiti.explorer.ui.custom.ToolBar;
import org.activiti.explorer.ui.mainlayout.ExplorerLayout;
import org.activiti.explorer.ui.management.processinstance.ProcessInstanceDetailPanel;
import org.activiti.explorer.ui.util.ThemeImageColumnGenerator;


/**
 * @author Frederik Heremans
 */
public abstract class ProcessInstancePage extends AbstractTablePage {

    private static final long serialVersionUID = 1L;

    protected LazyLoadingContainer processInstanceListContainer;
    protected LazyLoadingQuery lazyLoadingQuery;

    @Override
    protected ToolBar createMenuBar() {
        return new ProcessMenuBar();
    }

    @Override
    protected Table createList() {
        final Table processInstanceTable = new Table();
        processInstanceTable.addStyleName(ExplorerLayout.STYLE_PROCESS_INSTANCE_LIST);

        // Listener to change right panel when clicked on a process instance
        processInstanceTable.addListener(new Property.ValueChangeListener() {
            private static final long serialVersionUID = 8811553575319455854L;

            public void valueChange(ValueChangeEvent event) {
                Item item = processInstanceTable.getItem(event.getProperty().getValue()); // the value of the property is the itemId of the table entry
                if (item != null) {
                    String processInstanceId = (String) item.getItemProperty("id").getValue();
                    setDetailComponent(new ProcessInstanceDetailPanel(processInstanceId, ProcessInstancePage.this));

                    UriFragment taskFragment = getUriFragment(processInstanceId);
                    ExplorerApp.get().setCurrentUriFragment(taskFragment);
                } else {
                    // Nothing is selected
                    setDetailComponent(null);
                    UriFragment taskFragment = getUriFragment(null);
                    ExplorerApp.get().setCurrentUriFragment(taskFragment);
                }
            }
        });

        this.lazyLoadingQuery = createLazyLoadingQuery();
        this.processInstanceListContainer = new LazyLoadingContainer(lazyLoadingQuery, 30);
        processInstanceTable.setContainerDataSource(processInstanceListContainer);

        // Create column header
        processInstanceTable.addGeneratedColumn("icon", new ThemeImageColumnGenerator(Images.PROCESS_22));
        processInstanceTable.setColumnWidth("icon", 22);

        processInstanceTable.addContainerProperty("name", String.class, null);
        processInstanceTable.setColumnHeaderMode(Table.COLUMN_HEADER_MODE_HIDDEN);

        return processInstanceTable;
    }

    protected abstract LazyLoadingQuery createLazyLoadingQuery();

    protected abstract UriFragment getUriFragment(String processInstanceId);

}
